Adhesive composition



- Patented Nov. 7,1939

ADHESIVE comrosrrron no, a. Little, Wilmington, Dei., assignor to Hercules Powder Company, Wilmington, DeL, a corporation oi Delaware No Drawing. Application September 17, 1936, Serial No. 101,229

10 Claims. (01. l3423.7)

Heretoiore, resin adhesives possessing a tacky i Parts by weight or sticky nature, such as pressure sealing com- 1. Hydrogenated methyl abietate 50 5 positions, heat-sealing compositions, fly paper, Rosin 50 etc., have been prepared from a resin, such as 2. Hydrogenated ethyl abietate a 50 rosin, plasticized with an oil, such as castor oil, a Dammar gum 50 mineral oil, dibutyl phthalate, etc., by mixing the 3. Hydrogenated methyl abietate 30 ingredients together under gentle heat. Such Hydrogenated rosin; 70 10 compositions suffer from the disadvantage that 4. Hydrogenated ethyl abietate 40 the all employed is not compatible with the resin, Coumarone-indene resin 60 and that the oil tends to sweat out or to separate 5. Hydrogenated methyl abietate 30 from the composition, thus destroying its useful- Ester gum 70 1 ness. Such adhesive compositions have also suf- 6. Hydrogenated methyl abietate 60 1 fez-ed from the disadvantage that they tend to Manila gum 40 harden or oxidize in storage and in use, and thus 7. Hydrogenated benzyl abietate '70 soon become useless for the purpose intended. Rosin 30 I have now found that such disadvantag s as 8. Hydrogenated benzyl abietate 60 above enumerated may be wholly or substantially Ester gum 40 20 overcome by the use of a resinous composition adhesive comprising a resin and a hydrogenated Specific examples of heatfsealing resinous alkyl or hydrogenated aralkyl abietata hesives in accordance with this invention are:

The resinous adhesive compositions in accord- 5' ance with this, invention will contain as the L Hydrogenated methyl abietate Parts by g; resinous ingredient wood or gum rosin, ester gum, Manna gum 75 hydrogenate r dammar manna 2 Hydrogenated v coumarone-indene resin, etc., and as the-ta k Ester gum 85 forming component aplasticizer c mpa i l w Hydrogena'ted figggg}; 20 and soluble in the resin, such as a hydrogenated Dammar gum 8o 30 alkyl abietate, e. g. hydrogenated methyl abietate, hydrogenated ethyl abietate, etc., or a hy- Such adhesives, due to their lower content of drogenated aralkyl abietate, e. g. hydrogenated plasticizer, are less tacky, than the adhesives benzyl abietate. previously described, and require the application Generally, the proportion of hydrogenated, of heat and pressure in their use. 35 compatible plasticizer contained in my improved Specific examples of resingus adhesive cgmpoadhesive compositi s i comprise the range of sitions containing a film-forming ingredient, and about 2 Parts by Weight to about 60 Parts by of a nature to soften less readily at high atmosweight in the case of the use of hydrogenated pheric temperatures and to form in use a more 40 alkyl abietates, and the range of about 60 parts by permanent bond are as follows. 40

weight to about 80 parts by weight in the case of the use of hydrogenated aralkyl .abietates. The Pa t by w i ht amount of compatible plasticizer used in my. ad- 1. Hydrogenated methyl abietate 34 hesive composition will be dependent, generally, Rubber 6 upon the consistency andstickiness desired in Rosin 60 the composition, the type of res n employed 2. Hydrogenated ethyl abietate 40 therein, the nature of the compatible plasticizer Rubber 10 employed, and upon the use to which the composi Hydrogenated rosin tion is to be put. 3. Hydrogenated methyl abietate 40 50 Where it is desirable, in the use of certain ad- Polycyclo rubber 8 50 hesives, to render such adhesives more stable to Coumarone-indene resin 52 low temperatures, less sensitive to high, summer 4, Hydrogenated methyl abietatemur 40 temperatures, and such as ,to produce a strong, Ethyl cellulose a permanent bond, a film-forming ingredient may Hydrogenated rosin 52 55 be added to the above-described resin-plasticizer 5. Hydrogenated methyl abietate 46 55 adhesive. Such a filmforming ingredient may Vinyl acetate-chloride polymer 6 be, for example, chlorinated rubber, rubber, poly- Dammar gum 43 cyclo rubber, or pliolite, polymerized vinyl ae- 6. Hydrogenated ethyl abietate tate chloride, ethyl cellulose, benzyl cellulose, ni- Chlorinated-rubber 12 60 trocellulose, etc. Coumarone-indene resin 28 60 This invention relates to adhesive compositions, and in particular to resinous adhesive compositions.

Specific examples of pressure-sealing adhesive are as follows:

Such adhesives as the above find use as permanent bonding agents, e. g. in permanently adhering layers of cloth or other fabric to one another, adhering paper or fabric to metal, etc.

The resinous compositions in accordance with this invention will be conveniently prepared by blending together the ingredients by gentle heat, with or without the use of a solvent.

What I claim and desire to protect by Letters Patent is:

l. A pressure-sensitive, non-hardening adhesive composition consisting of a tacky mixture comprising a liquid organic hydrogenated abietate present in an amount within the range of about 25% to about 80% by weight of said composition and a resin forming at least the major portion of the remainder of the composition.

2. A pressure-sensitive, non-hardening adhesive composition consisting of a tacky mixture comprising a liquid organic hydrogenated abietate present in an amount within the range of about 25% to about 80% by weight of said composition and a resin forming at least the major portion of the remainder of the composition which includes not in excess of about 8% by weight, of the total composition, of a cellulose derivative selected from the group consisting of ethyl cellulose, benzyl cellulose and nitrocellulose.

3. A pressure-sensitive, non-hardening adhesive composition consisting of a tacky mixture comprising a liquid hydrogenated alkyl abietate present in an amount within the range of about 25% to about by weight of said composition and a resin forming at least the major portion of the remainder of the composition.

4. A pressure-sensitive, non-hardening adhesive composition consisting of a tacky mixture comprising a liquid hydrogenated alkyl abietate present in an amount within the range of about 25% to about 60 by weight of said composition and hydrogenated rosin forming at least the major portion of the remainder of the composition.

5. A pressure-sensitive. non-hardening adhesive composition consisting of a tacky mixture comprising hydrogenated methyl abietate present in an amount within the range of about 25% to about 60% by weight of said composition and hydrogenated rosin forming at least the major portion of the remainder of the composition.

6. A pressure-sensitive, non-hardening adhesive composition consisting of a tacky mixture comprising a liquid hydrogenated alkyl abietate present in an amount. within the range of about 25% to about 60% by weight of said composition and a resin forming the major portion of the composition which includes not in excess of about 8% by weight, of the total composition, of a cellulose derivative selected from the group consisting of ethyl cellulose, benzyl cellulose and nitrocellulose.

'7. A pressure-sensitive, non-hardening adhesive composition consisting of a tacky mixture comprising a liquid hydrogenated alkyl abietate present in an amount within the range of about 25% to about 60% by weight of said composition and hydrogenated rosin forming the major portion of the remainder of the composition which includes not in excess of about 8% by weight, of the total composition, of a cellulose derivative selected from the group consisting of ethyl cellulose, benzyl cellulose and nitrocellulose.

8. A pressure-sensitive, non-hardening adhesive composition consisting of a tacky mixture comprising a liquid hydrogenated alkyl abietate present in an amount within the range of about 25% to about 60% by weight of said composition and hydrogenated rosin forming the major portion of the remainder of the composition which includes not in excess of about 8% by weight, of the total composition, of ethyl cellulose.

9. A pressure-sensitive, non-hardening adhesivecomposition consisting of a tackymixture comprising hydrogenated methyl abietate present in an amount within the range of about 25% to about 60% by weight of said composition and hydrogenated rosin forming the major portion of the remainder of the composition which includes not in excess of about 8% by Weight, of the total composition, of ethyl cellulose,

10. A pressure-sensitive, non-hardening adhesive composition consisting of a tacky mixture comprising hydrogenated methyl abietate present in an amount within the range oi about 25% to about 60% by weight of said composition and a resin forming the major portion of the remainder of the composition which includes not in excess of about 8% by weight, of the total composition, of a cellulose derivative selected from the group consisting of ethyl cellulose, benzyl cellulose and nitrocellulose.

- JULIUS G. LITTLE. 

